Five years ago, this news would have made Sens. Lindsey Graham and John McCain, the Republican's erstwhile leaders on climate change and immigration, tear their hair out. Today, sadly, I think their follicles are safe:

A warming climate could see millions of adult
Mexicans migrate to the US as rising temperatures cause a drop in crop
yields, according to a study by researchers at Princeton University.

For every 10% of lost crop yields in Mexico, another 2% of Mexicans are likely to leave their country, the study says.